CloudTalk - Work locally, grow globally
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Zadarma - A new generation of VoIP for your business. Zadarma offers virtual phone numbers in 100+ countries, cloud PBX, and CRM systems.
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.
Sonetel - Sonetel is a communication app that lets you make an international business call at the cost of local calls.
TextMe - TextMe is a free calls and messaging application at both local and international levels.